Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
Aug. 27 Friday
Patrol.
Magnificent clear morning.
Had breakfast at 7, then started out to collect fossils among the loose burnt shale bed of the tent.
Along all the slopes one finds lears and rarely one invertebrate.
Many of these have drifted from higher beds or that all is now mixed.
I then climbed to a much higher level where there is an intruded mass of basalt and which seems to have been the cause of changing the color of some of the shale. I found a few fossils here and had them separate from those of lower levels.
The dip of the beds here is probably 15° towards the south so that the level of a fossils may be very varying and get far from their same horizon.
There can be no doubt that Elementary in correct is assuming that some of the red beds are burnt because of the presence of intrusive basalt and slags. Between the greater proportion of the red beds have this color due to something.
The cliffs beneath the basalt are very red and broadly are burnt but at lower levels where a creathent surface there is red shale in adjoining cliffs they are a dark carbonaceous shales.